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结合活塞环自动包装流水线控制系统的设计,介绍了PC在该控制系统中的应用,并进一步与电一气逻辑控制方案进行了比较。 相似文献
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Observation and Analysis of Gypsum Particleboard using SEM 总被引:2,自引:0,他引:2
冯谦 《武汉理工大学学报(材料科学英文版)》2007,22(1):44-47
The microstructures of gypsum board and gypsum particleboard were observed by SEM. The effects of retarder and waterproof agent on the shape and the average dimension of the gypsum crystal were discussed. The mechanism was investigated as well. Four typical instances, i e, the gypsum crystal shape, the gypsum combined with particles on the particles surface, the gypsum combined with particles on the wood cross section and the gypsum combined with particles inside the wood cell cavity were selected and observed. Furthermore, the agglomeration and cementation mechanism between gypsum and particle were studied. 相似文献
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Nano SiO2 was filled into gypsum particleboard. Effect of the amount of nano SiO2 particles filled, ultrasonic dissipating duration and treating the nano particles with different coupling agents on the mechanical properties of the board were studied respectively. The results show that nano SiO2 is helpful for the improvement of the properties. Adding 3%(mass fraction) nano SiO2 is the best for the improvement of both modulus of rupture(MOR) and modulus of elasticity(MOE) of the boards formed at 30 ℃ or 40 ℃. For the boards formed at 30 ℃, their MOR and MOE can be improved by 8.77% and 12.24%, and MOR and MOE of the boards formed at 40 ℃ can be improved by 44.44% and 108.38%.3% is also the best addition proportion to improve internal bond(IB) of the boards formed at 30 ℃, while 5% is the best for that of the boards formed at 40 ℃. At room temperature, dissipating nano Si02 into flake by ultrasonic has better effect on the properties of the final products. Through ultrasonic treating for 1 h and the best treating duration, the MOR and MOE can be increased by 41.99% and 47.80%. In addition, different coupling agents have different effects on the final properties too, and silane coupling agent KH570 is better for the improvement of properties of the boards formed at room temperature. 相似文献
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集成应用Pro/E和ANSYS,探讨在3种典型作业工况条件下,采用3种不同建模方法对高空作业车伸缩臂进行有限元分析,并以典型工况满载条件下的实测应力数据对不同的集成方法进行比较分析与评价.3种建模方法分别是伸缩臂各臂独立地进行Pro/E建模、将伸缩臂刚化为一个整体进行Pro/E建模以及用装配体进行建模.通过对伸缩臂的各危险截面上的12个点位进行有限元分析的数据与各点位实测数据的比较分析,得出结论:第一种方法相对误差较大;第二种方法建模方法简便,相对误差在可接受的范围,方法很有实用意义;第三种方法相对误差较小,便于后期进行结构优化,是设计与性能预测中值得注意的方法.同时,对危险截面的应力研究可供产品设计人员参考. 相似文献
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研究了食用菌培养基自动化包装生产线设备的工业设计,目的是使农业加工机械呈现美观、大方、人性化特征,改善工作条件,提高生产效率,易于为操作者接受。设计方案以工业设计理论为基础,由生产装置的特点、工作环境和加工要求,配合工程技术设计,做了简单几何形体及变形的组合、色彩的识别和装饰、优化各个部分之间布置和尺寸比例,体现了变化统一的整体美感。 相似文献
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聚苯板外墙外保温是建筑工程中应用比较早也比较广泛的一种方法,目前已经形成了比较系统的施工做法.由于该技术对施工水平要求非常严格,所以如果在施工过程存在疏漏,常常造成结露、渗漏等质量隐患.充分认识施工过程中的质量风险因素并采取适当的保证措施无疑将有助于外墙外保温施工质量的控制. 相似文献
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针对大型码头钢制栈桥使用环境恶劣、腐蚀严重、结构复杂等问题,以华润大东建造的法国加莱客滚轮渡码头的钢制栈桥为例,参考挪威 NORSOK M-501:2012、法国 ACQPA和 ISO 12944: 2018规范,结合钢制栈桥的腐蚀环境和结构特点,研究和分析了大型码头钢制栈桥防腐涂层系统的选用。根据码头钢制栈桥所处的腐蚀环境和设计的耐久性要求,提出和设计不同的涂层体系用于水下全浸区、浪溅和潮差区、大气露天区和压载水舱等;同时对其他沿海大型钢结构的防腐涂层系统的选用提供一定的借鉴和参考。 相似文献